220px|thumb|View of the Duomo by night.thumb|220px|High altar.Pietrasanta Cathedral (Italian:
Duomo di Pietrasanta or
Collegiata di San Martino) is a church in
Pietrasanta,
Tuscany, central
Italy. It is first mentioned in 1223, and was enlarged in 1330.
Exterior
The façade is covered with white marble. Over the three portals are
lunettes with scenes of the Life of Christ. On the right transept is another portal with
St. John the Baptist, a 14th century work by Bonuccio Pardini. The coat of arms on the main façade are memories of the
Genoese and
Florentine dominations, but there is also one of
Pope Leo X. The marble
rose window is attributed to Riccomanno Riccomanni (14th century).
The 36 m-tall
bell tower has a simple brickwork appearance, but was originally also to be covered with marble plates. It was finished in the late 15th-early 16th centuries by the Florentine architect Donato Benti. In the interior has a curious helicoidal staircase.
The baptistery (1786) was originally a 17th century oratory dedicated to
St. Hyacinth. It contains two baptismal fonts from 1385 and 1612.
200px|thumb|left|The nave.
Interior
The church is on the Latin cross plan with a nave, two aisles and a transept. Much of the decoration dates from the reign of
Christina, Grand Duchess of Tuscany, who in
1627 commissioned the restoration of the Collegiata to Florentine artists, who provided large devotional altarpieces and sculptures. Artists include painters
Matteo Rosselli,
Francesco......
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